Centrifugal roller-mill.



J. W. ADAMS.

CENTRIFUGAL ROLLER MILL.

APPLICATION FILED mum, 1914.

1,201,672. Patented Oct. 17,1916.

a SHEETS-SHEET 1.

31 u uawtoz wi/lwwooeo v m J. W. ADAMS.

GENTRIFUGAL ROLLER MILL.

AEPLICAT ION FILED MAR-$19M.

Patented Oct. 17,1916.

3 SHEETS SH EET 2,

314 uwwoz Wilt/macaw .l. W. ADAMS.

CENTRIFUGAL ROLLER MILL.

APPLICATION HLED MAR- 9 19'4- 1,201,672. Patented Oct. 17,1916.

3 SHEETS-SHEET 3- 1 f) I ,lumulunf ff ED STATES PATENT o n JAMES WALTER AIDA MS, OF SPRECKELS, CALIFORNIA,

CENTRIF'UGAL ROLLER-MILL.

Specification of Letters Patent.

Application filed March 9, 1814. Serial No. 823,456.

To' all whom it may concern:

Be it known that I, JAMES WALTER ADAMs, a citizen of the United States, re-' siding atSpreckels, in the county of Monterey and State'of California, have invented new and useful Improvements in CentrifugalRoller-Mills, of which the following is a specification;

My invention relates to improvements in centrifugal roller mills, being of that type the crushing point, this mechanism being generally indicated as plow mechanism; a change in the form of the conduit supplying air, and the employment of an adjustable device for controlling the degree of fineness of the material being discharged. Millsof this type employ an air blast for the purpose of creating a circulation of air through the mill by means of which the powdered material is discharged while that portion of material which is not crushed to the desired extent is returned to the crushing chamber to be again operated upon; this circulation of air is general throughout the crushing chamber, the air supply being through ports extending tangential to the bull-ring, the result being that there is a tendency for the material to be blown about. Where this blowing action" takes place at the crushing point,

it will be readily understood that the maximum capacityof the mill is materially reduced for the reason that. even though the material is delivered in proximity to such point by plow mechanism, the air currents will act to blow a considerable portion of this material away from that point.

This is one of the principal difficulties inherent to themills of this type in general use, and one of the objects of my inventionis to materially decrease if, not entlrely eliminate this diflicultyQ In practice I have found that a mill embodying the features of the present invention and employing but two crushing rollers in place of the four generally employed, will increase the efficiency of the mill from one hundred to. onehundred and fifty per cent., thus enabling a greatly increased'out- Patented Oct. 17, 1916.

put to be had with a decreased cost of manufacture and a decreased tendency to wear through areductlonin the number of active elements employed. The change in the form I of air conduit is by the provision of. a bafile so posltioned'that when in service air will be introduced through the tangential passages allke, while its removal will enable ready access to'be had to the conduit for the purpose of cleaning without the necessity for removing large numbers of parts or casings. Byemploying an adjustable sleeve at the discharge end of the mill separator the degree of fineness of the material being discharged can be readily regulated.

Other objects are to provide aconstruction which is simple and eflicient in operation, durable in construction, and which can be manufactured and mamtamed 1n servlce at a relatlvely low cost..

To these and other ends, the nature of which will be readily understood as the in-,

Vention is hereinafter disclosed, said inven tion consists in the improved construction and combination of parts hereinafter fully described, illustrated in the accompanying drawings, and more particularly pointed out p in the appended claims.

In the accompanying drawings, in which similar reference characters indicate similar, parts 1n each of the views, Flgure 1 1s a vert1- Y cal sectional View taken centrally through a mill constructed in' accordance with my invention, parts being shown in elevation.

of Fig. 1. Fig. 3 is an enlarged detailed sectional View taken on the line 33 of Fig.

- 1. Fig. 4 is-a fragmentary plan view of the plow in position Fig. 5 is'a view in elevation of parts shown in Fig. 4, looking in the direction of the arrow in said figure. Figs. 6 and 7 are cross sections of the plow taken on the lines 6 6 and 77 respectively of Fig. 5. Fig. 8 is a bottom plan View 'ofthe'cover plate.

Fig. 2 is a sectional view taken on the line 22 As heretofore referred to, the general ar-- rangement of parts of the mill is similar to that employed in what is generally known as the Raymond mill an exemplification of which is shown in the patent to Albert Raymond, No. 881,262, datedMarch 10, 1908, and

I'do not,'therefore, herein particularly de-' scribe the. partsof the general mechanism in detail, the general arrangement providing'for a vertical shaft 10 suitably driven,

said'shaft carrying a spider 11 in which are pivotally suspendedjournal boxes 12 carrying the shafts of crushing rolls 13 adapted -to cooperate with the crushing or bull-ring points throughout such inner wall, and in order that a substantially equal distribution of the air therethrough shall be had, I pref erably employ a bafiie 17 which may be removably positioned adjacent to a hand-hole 18, the presence of the baffle causing the air to travel solely in one direction through the conduit, while its removal will enable the introduction of a suitable cleaning implement through the hand-hole 18 to enable a ready cleaning of the'conduit to be had.

The separator portion of the mill is along the lines indicated in the patent referredto, the circulation of air being through the annular space between the drums 19 and 20 and thence downward through the discharge opening 21, the latter being provided with a sleeve 22, adjustable in suitable manner as by the use of the threaded rod 23, the position of the inner end of the sleeve controlling the amount of deflection of the air currents and consequently controlling the degree of fineness of the material being discharged, this latter feature being one of the improvements which I have provided in'connection with the Raymond mill. Similarly I employ a sleeve 24 adapted to move with the shaft 10,

this sleeve having its lower portion pro jecting outwardly, as at 24 and which is adapted to carry the plow mechanism now to be described.

As in mills of this type, a plow is provided for each crushing roll, but inasmuch as these structures are duplicates, I will specifically describe but one. Mounted on the flange 24 is a radial arm 25 having a laterally extending portion 25. 26 designates a plate carried by the arm 25, which plate preferably extends above the plane of said arm and which also has a downwardly projecting portion 26 curved along the general lines of the shoe or plow presentlydescribed, said part 26 acting as a supporting member for the plow or shoe, this arrangement being more particularly'shown in Figs. 3, 4 and 5. Secured to the plate 26 is a vertically extending plate 27 forming the major portion of the inner wall of the plow cavity, this plate extending into close proximity to the face of the crushing roll, and also having a laterally extending portion 27 the upper surface of which is substantially on the plane of the upper face of the bull-ring, said portion 27 forming a support for the cover plate 28, the latter being provided with slots 28 by means of which it may be adjusted on the said part 27 The cover plate forms the top of the plow cavity and ,projects rear- Wardly substantially to the crushing point,

being cut away at the rear, as at 30 (Fig. 4)

to permit the roll 13 passing to its crushing position, but providing for aformation of the smallest space possible therebetween without actual contact between the plow and the crushing roll, the purpose being to eliminate as much as possible the passage of air currents therebetween, this portion of the shoe or plow being in close proximity to the crushing point and hence the point where proper and complete delivery of the material to be crushed is to be had. At this particular point there is thus formed a substantially closed cavity, the Walls of which are provided at the bottom by the plow, on the outer side by the bull-ring, on the inner side by the crushing roll, and on the top by the cover plate 28. This cavity is approxi mately free from air current disturbances, since the lower Wall of the cavity (provided by the plow) is above the tangential openings 16, and the space between the roll and the plow is so small as to materially restrict, if not entirely prevent the passage of the currents therethrough under any degree of pressure, simple leakage not materially affecting or disturbing the material being delivered to the crushing point. The walls of the cavity therefore also constitute an inclosed passageway through which the material to be crushed must pass to the crushing point.

The inner or active face of the plow or shoe is generally curved,.cross sections of the shoe in Figs. 6 and 7 showing this face 30 as curved in cross section, while the showing in Fig. 5 indicates a general inclination upwardly and rearwardly as indicated by the dottedline 30. The point of the plow projects downwardly approximately to the bottom of the crushing chamber and the rotation of the sleeve 24 causes the point to take up materialdeposited at the bottom of the crushing chamber. Owing to-the curvature of the plow face, this materia'l is carried rearwardly without any tendency to clog or choke, there being an entlre absence of corners or angles 'on the 'outer side of this plow cavity, the result being that the material is led upwardly to the plane of the. bull-ring and passes into contact with said ring in advance of the crushing point, saidring, as heretofore explained, forming the outer wall of the cavity at this point. Consequently the materialcrushing point being located in close proximity to if not at the rear or discharge end of the plow cavity. This discharge end of the-cavity can be regulated to some' extent by manipulation of the cover plate 28 the latter covering to a greater or less extent the space in advance of this crushing point at will. i

It will thus be seen that I have provided a plow-structure which comprises the plow, its mounting, the plate 27 and the cover plate, and in which the mouth of the plow cavity is located some distance in advance of the crushing roll and is relatively large, with the forward end of the plow acting as a protruding lip for the mouth, the lip being so formed in cross section as to gradually direct the material taken up. by its point into the mouth in a direction leading gradually toward the bull-ring, the lip having a shape which provides an outer wall. to prevent the material being thrown outwardly by centrifugal action, and gradually leading rearward to the plane, of the bullring. The throat of the cavity is gradually contracted, being formed with practically- ,can take place, this discharge at the front of the plow approaching the direction of travel of the plow and, being over the topof the outer wall, it will not act to force the material from the lip; similarly, the undershape of the plow is such as. will enable the air currents to pass thereunder into the chamber, these currents, however, being practically prevented from reaching the throat of the cavity through the particular formation of the rear ofthe plow as heretofore pointed out. Consequently not only will the plow provide ,for maximum efliciency, but its arrangement is such as to provide a minimum resistance tothe entrance of the air currents, ,so that practically the maximum efficiency of the latter Will also be had, the result being that the efiiciency of this type of machine, is increased at least double, actual operations demonstrating these'facts, the' operations being with a less number of crushing rolls than that usually employed with thistype of apparatus. While I have shown and described what is believedtobe the preferred embodiment of the invention which will pro duce this result,it will be understood that changes and modifications therein may be found desirable or necessary to meet the varlous exlgencies of use, and I therefore desire to be understood as reserving the right to make such changes or modifications as may be found necessary or desirable, in so far as the same may fall within the spirit and scope of the invention as expressed in the accompanying claims.

Having thus described my invention, what I claim as new is: i

1. In a centrifugal rolling mill, the com bination with a bull-ring, and a crushing roll adapted to cooperate therewith by'centrifugal action, of a plow, and a housing at the rear of said plow constituting with the adjacent portion of said bull-ring and said crushing roll a substantially inclosed passageway to deliver material to the crushing point between said roll and bull-ring.

2. In a centrifugal rolling mill, the combination with the bull-ring, and a crushing roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned in advance of the crushing roll, said structure having a passageway to deliver material to the crushing point, said bull-v ring forming an outer wall of the passageway, said passageway gradually contracting I toward its discharge end.

3. In a centrifugal rolling mill, the combination with the bull-ring, and a crushing.

roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned in advance ofthe crushing roll, said structure comprising a plow and means cooperating therewith to provide a plow cavity spaced from the forward end of the plow with the bull-ring acting as one of the walls 1 of the cavity, the throat of the cavity being contracted and having its discharge in proximity to the crifihing point.

4. In a centrifugal-rolling mill, the combination with the bull-ring, and-a crushing roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned in advance of' the crushing roll, said structure comprisinga plow and means cooperating therewith to provide a plow cavity spaced from the forward end of the plow with the bull-ring acting as one of the walls of the cavity, said means including a cover plate overhanging the bull-ring and the crushing roll.

5. In a centrifugal rolling mill, the combination with the bull-ring, and a crushing roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned in advance of the crushing 'roll, said structure comprising a plow and means cooperating therewith to provide a plow cavity spaced from the forward end of the plow with the bull-ring acting as one of the walls of the cavity, said means including a cover plate overhanging the bull-ring and the crushing roll, said plate being adjustable to vary its overhang of the roll.

6. In a centrifugal rolling mill, the combination with the bull-ring, and a crushing roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned in advance of the crushing roll, said structure comprising a plow and means cooperating therewith to provide a plow cavity spaced from the forward end of the plow with the bull-ring acting as one of the walls of the cavity, the rear of said plow being recessed to receive the roll, whereby the plow may extend in proximity to the crushing point.

7. In a centrifugal rolling mill, the combination with the bull-ring, and a crushing roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned in advance of the crushing roll, said structure comprising a plow and means cooperating therewith to provide a plow cavity spaced from the forward end of the plow with the bull-ring acting as one of the walls of the cavity, said plow having its material- 'receiving face curved in cross section with a portion forming the outer wall of the plow advance of the cavity mouth.

8. Ina centrifugal rolling mill, the comv bination with the bull-ring, and a crushing roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned -in advance of the crushing roll, said structure comprising a plow and means cooperating therewith toprovide a plow cavity spaced from the forward end of the plow with the bull-ring acting as one of the walls of the cavity, said plow having its materialreceiving face curved in cross section with a portion forming the outer wall of the plow in advance of the cavity mouth, said curved face being inclined rearwardly and upwardly toward the crushing point. v

9. In a centrifugal rolling mill, the com bination with the bull-ring, and a crushing roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned in advance of the crushing roll, said structure comprising a plow and means 00- operating therewith to provide a plow cavity spaced from the forward end of the plow with the bull-ring acting as one of the walls of the cavity, said plow having its materialreceiving face curved in cross section with a portion forming the outer wall of the plow in advance of the cavity mouth, said curved face being inclined rearwardly and upwardly toward the crushing point, the rear of the plow being recessed to receive the roll, whereby said face will extend in proximity'to the crushing point. a

10. In a centrifugal rolling mill, the combination with the bull-ring, and a crushing roll adapted to cooperate therewith by centrifugal action, of a plow structure positioned in advance of the crushing roll, said structure comprising a plow and means cooperating therewith to provide a plow cavity spaced from the forward end of the plow with the bull-ring acting as one of the walls of the cavity, said plow having its materialreceiving face curved in cross section with a portion forming the outer wall of the plow in advance of the cavity mouth, said curved face being inclined rearwardly and upwardly toward the crushing point, said means including a cover plate adapted to overhang the bull-ring and crushing roll to extend said cavity to a point in proximity to said crushing point. I

ll.- In a centrifugal rolling mill, the combination with the bull-ring, and a crushing roll adapted to cooperate therewith by centrifugal action, of'a plow structure positioned in advance of the crushing roll, said structure comprising a plow and means cooperating therewith to'provide a plow cavity spaced from the forward end of the plow 1105 with the bull-ring acting as one of the walls of the cavity, said plow having its materialreceivi ngvface curved in cross section with a portion forming the outer wall'of the plow in advance of the cavity mouth, said curved 110 face being inclined rearwardly and upwardly toward the crushing point, said means including a cover plate adapted to overhang the bull-ring and crushing roll to extend said cavity to a point in proximity 11 to said crushing point, said cover plate being adjustable to control the amount of overhang, I

12. In a centrifugal rolling mill, the combination with a crushing chamber and a bull-ring, and a crushin roll adapted to cooperate with said bull-ring by centrifugal action, the crushing chamber wall having a plurality .of air-inlet openings positioned below said bull-ring, of a plow structure posi- 125 tioned in advance of said crushing roll, said structure comprising a plow having its under and outer surfaces sloping laterally away from the chamber wall adjacent said openings.

13. In a centrifugal rolling mill, the combination with a crushing chamber and a bull-ring, and a crushing'roll adapted to cooperate with said bull-ring by centrifugal 5 action, the crushing chamber wall having a plurality of air inlet openings positioned, below said bull-ring, of a plow structure rection of its extension and having its under and outer surfaces sloping laterally away from the chamber wall adjacent said open- 11105.

in testimony whereof I aflix my signature in presence of two witnesses.

J. K. Sm, L. L. PUTNAM. 

